CVE-2026-11834 Unauthenticated Command Injection via DHCP Option Handling in Multiple TP-Link Routers
Adjacent attackers can execute arbitrary commands with elevated privileges on TP-Link routers during initialization via crafted DHCP responses.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-11834?
CVE-2026-11834 is a high-severity command injection vulnerability in TP Link Systems Inc. Archer C20 v5, published on 22 Jun 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A command injection vulnerability has been identified in the DHCP option processing logic in multiple TP-Link router models, due to insufficient validation of externally supplied DHCP option data. An adjacent attacker may exploit this vulnerability by supplying crafted DHCP responses, potentially resulting in unauthorized command execution during device initialization or provisioning workflows. This typically occurs when the device is in a factory-default or unconfigured state.
Successful exploitation may allow an adjacent, unauthenticated attacker to execute arbitrary commands with elevated privileges, potentially leading to full compromise of the affected device and unauthorized administrative control.
Weakness: CWE-78
Which versions are affected by CVE-2026-11834?
How do I fix CVE-2026-11834?
No fix has been published for CVE-2026-11834 yet. Limit exposure of the affected software until one is available.
Upgrade, and pass arguments to programs as a list instead of through a shell. More about Command injection.
Is CVE-2026-11834 being exploited?
There is no known exploitation of CVE-2026-11834 in the wild and no public exploit code.
Public exploit code: 1 proofs of concept on GitHub.
Sources
Also known as GHSA-w296-94hj-pfcg.